Baffle for water-tube boilers



Aug. 114, E928.v 680,314

N. APPENZELLER BAFFLE FOR WATER .IUBE BOILERS I Filed Feb. 2, 1927 asteam boiler of the series tube and drum,

Patented Aug 14, 1928.

earse mom/Ian ABPENZELLER, or MILWAUKEE, WISCONSIN,

BAFFLE FOR WATER-TUBE BOILERS.

Application filed February 2, 1927. Serial No. 165,2f78.

This. invention relatesito baffles for watertube boilers of the seriesdrum andtube type, and particularly to baflles which are located withinand. longitudinally of the. rear bank of tubes in order to providedownward andupward passes for the products of coinbustion. N p

The object of my invention .1s to provide a metal-bafflingof simple,cheap, durable and eflicientconstruction which can be readilyassociated,.withthcinterior of the rear tube bank without theuse ofbolts or similar fastening devices. V

In the embodiment of my invention herein illustrated, theabafliecomprises a series of relatively-thin cast iron plates havinginterengaging joint portions arranged to, effect and maintain the closeassemblyof the plates throughout thebaifiing, area, and having inaddition lateral fins which cooperate with the adjacent boiler tubes tomaintain the plates in upright position, and :this withoutimpairingtheheating surface ofthe tubes; all, as' will behereinafter,described and claimed.

In the drawingsp Figure. 1 is-avertical section. through a portion of arear bank of tubesand the uping my improved bafliing in .position.

Fig. 2 is a transverse section through a portion of the side walls oftheboiler setting, showing a, plurality of bathe plates.

Fig; 3 is a Fig. 2.

F ,ig. Kl is a. rertical section, as on the line .4.4 of Fig. 2.

Fig; 5 is a perspective, View of .a pa ir, of bafiieplates, onesuperposed on the other.

;Ref'err ing to the drawings, 1'0; designates one of the upper steam-andwater drums of type; and '11 designates the rear, banlrof approximatelyVertical tubes I which connect the said drum, with the underlying muddrum (not shown) This bankof tubes is medially divided throughout thewidth of the boilerl bymeansofa novelbafiling struc turewhich-dependsfromthe upper drum productseof combustion amongst the tubes,

-as such. productsjtravelto-the. rearward I b reeching or smoke stack ofthe structure.

The baffling; comprises rectangular rela -H 'tudinal I illustrated. Y f

plan of the strucureshown in j tively thin plates 12 of cast iron whichare.

built up row by row from atransverse mem- ASSIGNOR T KIDWELL BOILER ber13 supported in and between the side walls 14 of the setting. Theupper'edge of each plate 12 is formed with curved reinforcing flanges15. which provide longigroove of approximately ,semi-cir cularcross-section. materially greater in w1dtl1 .than the thickness oftheplates, as shown, and the faces of each plate adjacent its lower;edge are provided with longitudinal fins 1'7. lVith the exception of theend plates at the right hand side of the structure (asillustratedfeachof the plates is formed atone end;.wit h curvedreinforcing flanges 16, which, similarly, to the flangeslop I provide agroove of approximately semi-circularcross-section, nate short of thatendof theplate remote 'from the flanges 16, and the fins 17 te m Theflanges l termi-f nate short of the respectiye endsof the plate, so thata plurality of the plateslcan be as sembled with interengaging jointportions, as

The memberl3 is preferably a thin castlron plate having a basalreinforcing flange;

17 andalso haying along'itsupper edge g curved flanges 1 6 which providea longh per stean1.-andwater drum ofa'bo len, showtudinal groorethroughout the length of the plate, The member l3constitutes, in effect,a continuous basal bafiie,plate which in the initial installation ofthebafliing is locate d slightly lower than its correct position. Thefirst; row of plates 12 are then supported on the member 18 with. thebottom edges of the rowsseatedin the grooved portion of such memberandwith the abutting plane and grooved ends of the adjacentplates ininterlocking relation.

edges of the fins l'i'bear against the adj acent flanking tubes 11. andmaintain the plates 12 in spaced parallel relation thereto orsubstantially so, without impairing the heating The thin longitudinalsurface of the} tubes.'. The, end plates of. the 1 row are preferablyprojected intothe inner side walls of the setting, as indicated at 1 8,

{so as to compensate forslight variations in thewidth of the furnace andto ensure close jointsbetween the walls and the, contiguous andterminates short of the muddrum ,to afs ford downward and upward passesforfthe edges of the plates. The second row of plates 12' are thenerected on the first row, with the, bottom edges of the. second, rowseated in the grooves provided by the flanges 16 of the first row, andsimilarlythe successive rows of plates are built up and articulateduntil the space between the basal sup porting plate 13 and the drum hasbeen angle to accommodate the curvature of the weight than the thickrefractory tiles usually upper'ends of the tubes. This done'the basalplate 13, together with the superimposed plates 12, is raised by jacksor other means, until the top row of bafiie plates is in close contactwith the drum 10, and the parts are thus temporarily held in closeinterlocking relation until the brick sidewalls are com.- pleted,whereupon the jacks are removed. Thus' an eifective 1 self-supportedbaiflin'g structure, free from bolts '01 similar fastening devices, iserected within the rear tube bank of theboiler.

The grooves provided flanges 15 along the top of the uppermost row ofbattle plates, afford a simple and eiflcient seat for an asbestosropepas 19, which rope ensures a tight seal or gasket joint between thesaid plates and the drum when the bafilingis completed.

From the foregoing described construction embodying my invention it willbeseen that relatively thin cast-iron baiile stantial dimensionsareprovided. The 1011- gitudinal fins 17 to prevent thew'arpingand bucklingof the baffle plates not only while cast but also while they are theboiler heat. area are of less they are being subjected to the action ofThese plates for a' given associated with the rear tubebank, and,

therefore, they can be made'andinstall'ed in larger sizes andwithlesslabor'than is practicable with refractory tiles, thus decreasing thenumber of joints consequent upon the use of 'the latterg The novel castiron baffling also overcomes upper portions of theftubes', and, besides,such metal battling is naturally less liable than refractory tilestobreak at thejoints.

It'is of'course to be understoodfthat in stead of the particularsupporting mean's herein shown and. described-for the baflie hertypeottmain support there- 7 plates any at for may be employed; that if desiredin any case the plates {which areasso'ciated with the V bends ofthetubes maybe curvedinstead of V straightjan'd that, mother respects, thedis closed constructionmaylbe modified without departurefrom theprinciple of my invention q and the scope of the appended claims.

I claim-- l'JIn a 1 7b ank" ot water tubes and the overlying drum towhich-they are connected,"of integral cast bled plates and by the curvedplates of sub-" I g in close'relation to the saiddrum' gitudinalflangeslfi co-operate with the lonthe plates of the respective rowsaving infor supporting said plates'fin assembled ionv r terlockingrelation I j boiler ottlie series drum and tube type, the combinationwith v the "rearward"! rows between adjacent tubes, the abuttinglongitudinal edges of the plates of the respective rows havingarticulated joints, said joints being formed similar laterally extendingflanges along the edges of the plates of one row, there being arelatively wide arcuate groove between the flanges in which areseatedthc edges of the plates in adjacent rows, and means supporting theasseindrum.

2. In a boiler of the series drum and tube V V I the 'combinationY'withthe rearward i ty e V o of water tubes and the overlying drum so;

bank

rows between adjacent tubes, the abutting longitudinal edges of the,plates'of the respective rows having articulated joints, said jointsbeing formed by similar laterally extending flanges along theedgesfofthe plates of one row, there being a relativ'ely wide arcuategroove between thef flanges in which are seated the edges of the platesin adja-- cent rows and the bodiesof said plates having spacing meansincontact withfthe tubes, and means supporting the assembled plates andmaintaining the uppermost rowthereof 95,- 3'. In a boiler of the seriesdrumand tube type, the combination with 'the" rearward bank of: watertubes, of integral cast iron baflie plates assembled in successiverowsbetween adjacent tubes, the abuttin edges of terlocking joints,.saidjoints being --forined i by similar latralliy extending flanges 3 alongthe edges fof'the p ates of o'ne 'riiiw,there.-bB- ing a relatively widearc'uate groove between theflanges in which are seatedth'e edges of theplates inadjacent rows andilsaidplates having longitudinal reinforcingandspacing I the objections .attendantthe f use of eather edge tilingwithin the'curve'd fins' bearing" against the adjacent tubes, and lmeans for supportingsaidplatesin'interlockingrelation'.

4. In a boiler'of theser'ies'druin and type, the combination" with therearward V bankof water tubes, er integral 'castiron,

baflle plates assembled in successive rows bethe plates engaging theabuttingedges of the adjacent'plates, saidFplates-alsohaving-10ngltudlnal relnforclng and'spacin'g finsbean; mg against the adacent tubes, and "means i 5'. In 'aboiletoftheseriesidrum and tubemaintaining the uppermost 75 7 row thereof in? close relation to thesaid;

edges of the platesof the respective rows having interlocking joints 1constituted by wide arcuate grooves in flange portions on the platesengaging the abutting edges of the adjacent plates, said plates alsohaving longitudinal reinforcing and spacing fins bearing against theadjacent tubes, and a continuous supporting plate having a grooved upperedge portion which receives the lower edges of the first row of baflleplates. vi

6. In a boiler of the series drum and tube 7 type, the combination withthe rearward bank-oi water tubes, of integral cast iron bailie platesassembled in successive rows between adjacent rows of tubes, each platehaving a relatively wide arcuate groove in a flange portionalong itsupper edge and having lateral longitudinal fins spaced from the loweredge of the plate, and means for tubes, said baffling including a row ofangularly disposed plates arranged in close relatively wide arcuategroove between the flanges for the reception of the edge of anotherbattle plate.

9. A thin metallic baifle plate for boilers having similar laterallyextending curved flanges along one of its longitudinaledges and alongone of its ends, there being a relatively wide arcuate groove betweenthe flanges for the reception of the edge of another baffle plate.

Signed at Milwaukee, in the county of Milwaukee and State of WVisconsinthis 28th day of January, A. D. 1927.

NORMAN APPENZELLER.

